/Engine/Source/Runtime/RHI/Public/RHICommandList.h
struct FRHICommandCopyToStagingBuffer : public [FRHICommand< FRHICommandCopyToStagingBuffer, FRHICommandCopyToStagingBufferString__LINE__ >](API\Runtime\RHI\FRHICommand)
FRHIStagingBuff...
DestinationStagingBuffer
uint32
NumBytes
uint32
Offset
FRHIBuffer*...
SourceBuffer